I recently markl moded my k701's using blue tack as a "trial" attempt. I can't take pics at the moment, but I will when I open them up again to do a real markl mod using dynamat. I wantd to mod them to increase the bass impact, but I don't think I got much of a difference in terms of bass. But what I got instead was a tighter low end. Its weird because I've always thought the k701's were nice and tight to begin with, but now its got an even tighter low end.
I was listening to coldplay's "Life in Technicolor" and what I think are bongos in the background are nice and clear, never fully noticed them before, but I gotta try these out to see if the high end was sacrificed in someway. Pics will be up tomorrow, But I gotta find a local dynamat source.